The 8x5 Diet for Bile Acid Diarrhoea: A Feasibility Randomised Controlled Trial

Inclusion Criteria: * Age ≥ 18 years, of any ethnic group, living in the United Kingdom and not planning to move home for the next three months * Self-reported diagnosis of bile acid diarrhoea that was confirmed by 7-day SeHCAT testing * Self-reported ongoing chronic diarrhoea despite use of appropriate medication * Able to participate in either diet group with the intention to remain in the group to which they were assigned for the 8 week study period * Body mass index ≥20 kg m-2 * Able to converse in English (or via their carer, without assistance from an interpreter) using a computer/laptop, smart phone, or tablet * Able to provide informed written consent * Able to provide the address of their general practioner so that the research team can inform them of their participation. Exclusion Criteria: * Unable to provide self-reported written confirmation that their diagnosis of bile acid diarrhoea was by SeHCAT testing * Pregnant/breastfeeding/planning a pregnancy in the next six months * Inflammatory bowel disease, previous or current microscopic colitis, or other serious morbidities such as liver disease, pancreatic disease, AIDS/HIV, radiotherapy for cancer, assessed at screening via patient self-report * Diarrhoea that is inadequately active: \<3 stools per day or \<1 watery stool (Bristol Stool Form types 6-7) per day as the mean of one week * Currently participating in another research study or has taken part in the previous 3 months * If taking insulin…